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| 密度梯度离 心: 17 phrases in 10 subjects |
| Agriculture | 5 |
| Animal husbandry | 2 |
| Chemistry | 1 |
| Dermatology | 1 |
| Earth sciences | 1 |
| Ecology | 1 |
| Genetics | 2 |
| Life sciences | 1 |
| Polymers | 2 |
| Technology | 1 |
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